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Title

A factorization approach to sensitivity loop shaping for disturbance rejection in hard disk drives

Author(s)

Zheng, Jinchuan;  Fu, Minyue;  Du, Chunling;  Wang, Youyi;  Xie, Lihua

Abstract

This paper investigates a factorization approach to sensitivity loop shaping for disturbance rejection in hard disk drives (HDDs). The advantage of the factorization approach is that the system sensitivity function can be expressed explicitly in terms of a unique design parameter. This greatly simplifies the control design process to make the system sensitivity function match a chosen target sensitivity function with guaranteed stability. By decomposing the controller structure, the design parameter is revealed to behave as a plug-in disturbance filter, the design of which is then presented to suppress the dominant disturbances at some specific frequencies. It is also shown that based on the nominal control system the proposed disturbance filter can reduce the sensitivity gains at specific frequencies without worsening the neighbouring sensitivity gains. Simulation together with implementation results demonstrate that the proposed method can effectively suppress the disturbances around the servo bandwidth and accordingly offers a superior tracking accuracy in comparison with other existing filters.

Publication type

Journal article

Source

IEEE Transactions on Magnetics, Vol. 46, no. 5 (May 2010), pp. 1220-1227

Publication year

2010

FOR Code(s)

02 Physical Sciences;  09 Engineering

Keyword(s)

Control design process;  Control system stability;  Controller structures;  Coprime factorisation;  Design parameters;  Disturbance filter;  Disturbance rejection;  Drives;  Factorization approach;  Hard disk drives;  Hard disk storage;  Loop-shaping;  Positioning control;  Reception quality;  System sensitivity function;  Tracking accuracy

Publisher

IEEE

ISSN

0018-9464

Publisher URL

http://dx.doi.org/10.1109/tmag.2010.2040921

Copyright

Copyright © 2010 IEEE. The published version is reproduced in accordance with the copyright policy of the publisher. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Full text

Peer reviewed